cboot-t18x: drop extlinux patch addition
cboot-t18x: drop extlinux patch addition

which is in common code, but not included in the t18x version.

Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>

madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra